Machine for dressing contact surfaces of commutators



Jam-16, 1923. lAZQZ J, MYERS. MACHINE FOR DREsslNs CONTACT SuRFAcss oF CoMMuT/Armm,

FILED DEC. 28. 1'921. HEET=HT 1 INV-ENTOR @MES MYERJ.

Jam 16, 1923.. 11,442,492

J` MYERS. MACHINE FoR'DREssING CONTACT SuRFAcl-:s oF CoMMuTAToRs.

FILED Dsc. 28. 1921. 3 SHEETS-SHEET 3 INVENTOR LAMES MYERJO Patented dan. 16, 1923.

SATS

JAMES MYERS, OF HOWELL, ALBERTA, CANADA.

MACHINE FOR DRESSING CONTACT SURFACES OF COIVIM'TATORS.

Application filed December 28, 1921.

To all io/wme't may concern Be it known that I, JAMns Mimes, a citizen of the Dominion of Canada, residing` at Bowell, in the county of Medicine Hat and Province of Alberta, Dominion of Canada, have invented certain new and useful Improvements in Machines for Ihfessiug Contact Surfaces of Commutators, of which the following is a specification.

The present invention appertains to a new and useful device for re-grindiug or or dressing worn or uneven contact surfaces of commutators which are adapted for use more particularly on the so called Ford or Fordson motors.

rIhe principal object of the invention is to provide a device of the character described which is capable of performing the aforementioned operation accurately and thoroughly, requiring no especial skill to operate the device andiu' the minimum length of time.

Among the other aims and objects of the invention may be cited the provision of a.l device of the character described with a view to compactness, in which the number of parts is few, which may be economically constructed and is symmetricalin appearance.

Vith these and other objects in view, the invention consists in the construction, combination and arrangement of parts as will be hereinafter fully described, illustrated in the accompanying drawings and pointed out in the claims hereunto appended.

In the drawings:

Figure 1 is an end elevation of the device.

Figure 2 is a side elevation.

Figure 3 is a top plan view.

Figure 4 is a. transverse section taken on line 4 4 of Figure 3. y

Figure 5 is a vertical loilgitudinal section illustrating portions in elevation. y

Figure 6 is a perspective view of the base, and

Figure 7 is a perspective view illustrating the gear holding bracket.

Figure 8 is an end elevation.

In the drawings similar characters of reference designate like parts.

The numeral 9 indicates the base of the device which has lugs 10,11, 12 and 13 integral therewith and extending laterally. Apertures 14, 15, 16 and 17 are bored in these lugs for reception of bolts, the func- Serial No. 525,522.

tion of which to secure the base to a suitable support. A web 18 integral with the arcuately conligurated portions of the base and extending vertically therefrom has the bearings 19 and 2() formed on its .upper extremity, the function of which will he later explained.

Referring now more particularly to F igures 4 and 5 a sleeve 21 is positioned in a longitudinal aperture in the base 9. An arm 22 is integral with the sleeve 21 and diverges into a semi-circular bracket indicated by the numeral 23, more clearly illustrated in Figure 7. The semi-circular member 24 clamps to the semi-circularly configurated member Q3 by means of bolts 25 passing through lugs 2G and 2T and the lugs 2S and 29 of each respe-tive member. 3() indicates a gear which has an open central portion and an annular race indicated by the numeral 31 integral therewith and extending" inwardly. In this race are scated the members 23 and 24. It may be necessary to shim the member 24 to permit free rotation of the member 30, although the embodiment of the shims has not been illustrated.

Transverse shaft 32 is rotatably positioned in the longitudinal apperture in the sleeve 21 and if desired the interior of the sleeve may be babbitted, forming a proper bearing. A pinion 83 is secured to the outer terminal of the shaft 32, the function of which will be explained later. A collar 34 positioned on the sleeve 21 secures the same in position. Pulley 35 is positioned ou one terminal of the shaft 32 and has an offset hub 3G. The numeral 37 indicates a set screw which secures the pulley wheel 35 to the shaft 32. Bearings 19 and Q() are provided with caps 38 and 39 secured in position by means of the bolts 40. Journalled in the bearings 19 and Q() is the shaft 41 on which is keyed or otherwise substantially secured the pulley 42, @n the inner terminal of the shaft 41 a washer 43 is positioned. A fibre washer 44 bears against the washer 43. The emery wheel 45 bears against the fibre washer 44, the function of which is to secure the same rigidly without breaking. The emery wheel 45 is secured .in position by means of the washer 46 and the nut 47 which is mounted on the threaded terminal 45% of the shaft. On the opposite extremity of the shaft a pulley 49 is positioned. Tasher 50 is positioned intermediate the pulley 49 and the emery wheel 51. llllasher 52 bears against the outer face of the emery wheel and in co-opera'tion with the sleeve 53 and the nut 54, which is positioned on the threaded terminal 55 of the shaft, secures the emery wheel 51 in position.

It is obvious that the hub 3G being offset from the pulley wheel 35 permits the same to assume vertical alignment with the pulley 49. Belt 5G is trained over the pulley wheel 35 and the pulley 49 the function of which is to transmit power from the shaft 41 to the shaft 32.

Referring more particularly to Figures 3 and 4 a lug 57 integral with the semi-circular member 23 more clearly illustrated in Figure 7 has a bolt 58 passing through thc saine. The opposite terminal of this bolt passes through an aperture 59 in the web 18 of the base and has a head 60 positioned on the web 18. A washer 61 and collar G2 are illustrated, althoi'igh the same are not essential. Coil spring 63 is positioned over the bolt 58 intermediate the collar 62 and the lug 57. Wing nut 64 is positioned on the outer threaded terminal G5 of the bolt 58. l/Vhen the wing nut G4 is turned the same bears against the lugv 57 moving the gear 30 laterally, the object of which will be explained later.

A member 66 is secured in position by means of the bolt 68. One terminal (59 of the member 66 bears against the extended portion 70. The opposite terminal of this member is enlarged as indicated by the numeral 71 and has a threaded aperture'in which is positioned the member 72. The commutator, the contact surface of which is to be re-ground, is indicated by the numeral 73 and is clearly shown in position in Figure 5. rIhe inner edge of the commutator seats inthe recessed portion 7 4. Then the commutator is in position as indicated in Figure 5the member 66 is positioned as illustrated. The terminal 69 of the member 6G bears against the extended portion TO integral with gear 30. 'Ihe member 72 is positioned in the opposite terminal of the member G6 and is then actuated until the inner terminal-thereof bears against the concave portion 75 of the commutator and secures the same rigidly in position, the grinding operation then takes place.

Power is applied to the pulley 42 from any suitable source, such as an electric motor, and is transmitted from the shaft 41 to the shaft 32 by means of the belt 56 trained over the pulley 49 and pulley wheel 35. The pinion 33 mounted on the opposite terminal of the shaft 32 drives the gear 30 in the opposite direction to that of the emery wheels 45 and 51.` It is obvious that with the ratio of gearing as described and illustrated, the emery wheel 45 will rotate at a much `greater speed than the gear 30. The emcry wheel 45 bears against the inner contact surface of the commutator and grinds Vthe worn and uneven surface of the same true. The amount to be ground may be regulated by means ofthe wing nut 64, which upon actuation, moves the gear 30 and its associated mechanism and commutator laterally towards or away from the emery wheel 45. The gear 30 rotated in the opposite direction to the high speed emery wheel 45 effects an evenly ground Contact surface in the commutator.

IV hen the commutator is groundythe actuation of the shaft 41 is stopped and the member 72 rotated retrogressively. This permits the member 66 to be turned laterally, thus permitting the removal of the commutator. The emery wheel indicated'by the numeral 51 is to be used for sharpening` tools or for any other useful purpose.

From the foregoing description it will be readily apparent that I have provided a device of the character described which is capable of performing the valleged functions efficiently and economically and while this specification manifests in detail the present and preferred construction of the invention, I desire to have it understood that' such de-l viations from such detail may be resorted to as do not form a departure from the spirit of the invention as defined by the appended claims.

That I claim as new is:

1. A device of thevcharacter described, comprising in combination a base, a sleeve positioned in the said base having a supporting bracket integral lwith one terminal thereof and extending upwardly, a driven shaft through the said sleeve, a pinion on the said driven shaft to drive a gear and commutator holding mechanism rotatably mounted on the Asaid supporting bracket, gear and commutator holding mechanism. a drive shaft journalled on the said base` grinding mechanism on the said drive shaft, means actuating the said driven shaft by the said drive shaft and means imparting lateral movement to the said gear and commutator holding mechanism for the purpose set forth.

2. A deviceof the character described, comprising in combination a base, a sleeve in the said base having a supporting arm integral with one terminal'thereof, the sai-d supporting arm formed into a semi-circular member, a semi-circular member engage'able with the said semi-circular member, a driven shaft through the said sleeve, a pinion on the said driven shaft to drive a gear and commutator holding mechanism rotatably mounted in the said semicir`cular members, gear and commutator holding mechanism, a drive shaft journalled on the said base, grinding mechanism on the said drive shaft, a pulley on the said drive shaft, a secondary pulley on the said drive shaft, a pulley Wheel on the said driven shaft, a belt trained over the last mentioned pulley and said pulley Wheel and means imparting lateral movement to the said commutator holding mechanism for the purpose set forth.

3. A device of the character described, comprisingl in Combination a base, a sleeve in the said base having a supporting arm integral 1with one terminal thereof, the said supporting arm formed into a semi-circular member, a semi-circular member, engageable with the said semi-circular member, a driven shaft through the said sleeve, a pinion on the said driven shaft to drive a gear and commutator holding mechanism rotatably mounted in the said semi-circular members, gear and oommutator holding mechanism, a drive shaftjournalled in the said base, grinding mechanism on the said drive shaft, a pulley on the said drive shaft, a secondary pulley on the said drive shaft, a pulley Wheel en the said driven shaft, a belt trained over the last mentioned pulley and said pulley Wheel and means imparting lateral movement to the said commutator holding mechanism for the purpose set forth, said means comprising a member extending from the said base through a lug on the said gear, a portion of the said member extending through the said lug and threaded for the reception of a Wing nut, a coil spring over the said member intermediate the said lug and the said base, substantially as described.

4t. A device of the character described, comprising in combination a base, a sleeve in the said base, having' a supporting bracket integral with one terminal thereof and extending upwardly, a driven shaft through the said sleeve, a pinion on the said driven shaft to drive a gear and commutator holding mechanism, gear and commutater holding mechanism, the said commutator holding mechanism consisting of an annular recessed portion, a flange centrally disposed in the said gear and offset therefrom, a post on the said gear, an arm pivoted intermediate its ends on the said post, one terminal of the said arm arranged to bear against a projection on the said gear, a member threadedly engaged with the opposite terminal of the said arm, the inner terminal of the said member arranged to bear against the commutator to be secured, a drive shaft journalled on the said base, grinding mechanism on the said drive shaft, means actuating the said driven shaft by the said drive shaft and means imparting lateral movement to the said gear and commutator holding mechanism for the purpose set forth.v

In testimony whereof, I hereunto aliii: my signature in the presence of two Witnesses.

JAlvlES MYERS. Witnesses:

FRANK BAIRD, CHRISTINA VVA'rnRs. 

